V1472 Aquilae
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Aquila |
| Right ascension | 20h 05m 26.54815s |
| Declination | +15° 30′ 01.5064″ |
| Apparent magnitude (V) | 6.406 |
| Characteristics | |
| Spectral type | M2.5III |
| U−B color index | 1.76 |
| B−V color index | 1.64 |
| Variable type | Semiregular pulsating Star |
| Astrometry | |
| Radial velocity (Rv) | -111.70 ± 0.3 km/s |
| Proper motion (μ) | RA: 36.64 ± 0.86 mas/yr Dec.: 20.16 ± 0.78 mas/yr |
| Parallax (π) | 2.4 ± 1.0 mas |
| Distance | approx. 1,400 ly (approx. 400 pc) |
| Absolute magnitude (MV) | -2.6 ± 1.0 [1] |
| Details | |
| Radius | 104 ± 56[1] R☉ |
| Luminosity | 1100[1] L☉ |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Data sources: | |
| Hipparcos Catalogue, CCDM (2002), Bright Star Catalogue (5th rev. ed.) | |
V1472 Aquilae is a semi-regular pulsating star in the constellation Aquila. It is actually a binary star system, the main component being a red giant of spectral type M2.5 III. Original calculations using hipparcos data gave a parallax of 7.92 ± 1.07 milliarcseconds, but reprocessing to allow for orbital motion adjusts the parallax to 2.4 ± 1.0 milliarcseconds—tripling the system's distance from Earth. The main star has a diameter 104 ± 56 times and luminosity 1100 times that of the Sun. The stars orbit each other every 196 days.[1]
References
- ^ a b c d Boffin, H. M. J.; Hillen, M.; Berger, J. P.; Jorissen, A.; Blind, N.; Le Bouquin, J. B.; Mikołajewska, J.; Lazareff, B. (2014). "Roche-lobe filling factor of mass-transferring red giants: the PIONIER view". Astronomy & Astrophysics. 564: 13. arXiv:1402.1798. Bibcode:2014A&A...564A...1B. doi:10.1051/0004-6361/201323194. A1.
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